If you forget this Admin password, you will need to reset it

1.
Insert the original Mac OS x installer CD.
2.
Double-click the “Installer” icon to start the process of reinstalling. You are not really going to reinstall!
3.
When you get to the Install screen, go to the Utilities menu.Choose “Reset Password….”
4.
Enter your new password. Write it down in a safe place!
5.
Quit the Installer from the Installer menu.
  • Login password: If you have set up multiple users on one Mac, each user has her own password to log in. An Admin password is also the login password for that Admin user. By default, your Mac is set to auto-login the Admin so you don't need your password at startup (you can turn this off).

    If a standard user forgets his password: The Administrator ...

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